For Repentance of a Disbeliever

O Mohammad, and whoever is a disbeliever and desires repentance and faith, he should purify his body and clothes for me, then he should face my Qibla and place the skin of his forehead on the ground in prostration for me, for indeed, there is no barrier between me and him, and he should say:

يَا مَنْ تَغَشَّى لِبَاسَ النُّورِ السَّاطِعِ الَّذِي اسْتَضَاءَ بِهِ أَهْلُ سَمَاوَاتِهِ وَ أَرْضِهِ وَ يَا مَنْ خَزَنَ رُؤْيَتَهُ عَنْ كُلِّ مَنْ هُوَ دُونَهُ وَ كَذَلِكَ يَنْبَغِي لِوَجْهِهِ الَّذِي عَنَتْ وُجُوهُ الْمَلاَئِكَةِ الْمُقَرَّبِينَ لَهُ. إِنَّ الَّذِي كُنْتُ لَكَ فِيهِ مِنْ عَظَمَتِكَ جَاحِداً أَشَدُّ مِنْ كُلِّ نِفَاق، فَاغْفِرْ لِي جُحُودِي فَإِنِّي أَتَيْتُكَ تَائِباً وَ هَا أَنَا ذَا أَعْتَرِفُ لَكَ عَلَى نَفْسِي بِالْفِرْيَةِ عَلَيْكَ، فَإِذْ أَمْهَلْتَ لِي فِي الْكُفْرِ ثُمَّ خَلَّصْتَنِي مِنْهُ فَطَوِّقْنِي حُبَّ الاِْيمَانِ الَّذِي أَطْلُبُهُ مِنْكَ بِحَقِّ مَا لَكَ مِنَ الْاَسْمَاءِ الَّتِي مَنَعْتَ مِنْ دُونِكَ عِلْمَهَا لِعِظَمِ شَأْنِهَا وَ شِدَّةِ جَلاَلِهَا وَ بِالاسْمِ الْوَاحِدِ الَّذِي لاَ يَبْلُغُ أَحَدٌ صِفَةَ كُنْهِهِ وَ بِحَقِّهَا كُلِّهَا أَجِرْنِي أَنْ أَعُودَ إِلَى الْكُفْرِ بِكَ، سُبْحَانَكَ لا إِلهَ إِلاَّ أَنْتَ غُفْرَانَكَ إِنِّي مِنَ الظَّالِمِينَ. 

O One who is enveloped in the garment of radiant light, by which his heavens and earth are illuminated, and O One who conceals His vision from all who are beneath Him, and such is fitting for His countenance, which the faces of the closest angels are humbled for, indeed, that which I was in with regards to You, denying Your greatness, is more intense than all hypocrisy. Thus, forgive my denial, for I came to You in repentance, and here I am, confessing to You against myself about ascribing lies and slander against You. So, when You gave me respite in disbelief, then delivered me from it, therefore, encircle me with the love of faith that I seek from You by the right of what is for You of the names which You have prohibited others besides You from knowing due to the greatness of their status and the intensity of their majesty. And by the one name that the Absolute-One that no one can comprehend the essence of, and by its right, all of it, protect me so that I do not return to disbelief to You. Glory be to You! There is no god but You. Your forgiveness! For I am among the wrongdoers.

For indeed, when he says such, he does not raise his head except with satisfaction from me, and this [repentance] for him is accepted.

Bihar Al-Anwar (ed. - Beirut), vol. 92, p. 308